[jdk16u] RFR: 8261251: Shenandoah: Use object size for full GC humongous compaction

[Zhengyu Gu]

On Mon, 1 Mar 2021 12:53:04 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This fixes a minor performance issue in Shenandoah (which becomes asserted in later projects, i.e. Loom).
> 
> Additional testing:
>  - [x] hotspot_gc_shenandoah

Marked as reviewed by zgu (Reviewer).

-------------

PR: https://git.openjdk.java.net/jdk16u/pull/55